DE3412917A1 - RECORDING DEVICE FOR RECORDING WITH HEATING ENERGY - Google Patents

Description

Recording device for recording with thermal energy.

The invention relates to a thermal energy recording apparatus and more particularly to an apparatus for multipart high density recording using the thermal energy.

One of thermal energy recording systems is known , for example, as a Tiny Beam recording apparatus, which is described in U.S. Patent 4,330,787. With this ink jet recording apparatus, high speed color recording can be easily carried out, the apparatus including a recording head used as a main output part. The recording

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~ ⁴ EN 38 21

head can be used to eject the recording liquid for forming flying droplets a variety of Ejection openings or nozzles that have a high density are arranged. This allows the recording head to be used as a Whole can be made compact and advantageous, in mass production can be produced, resulting in a higher resolving power. Furthermore, the recording head can be manufactured by having a satisfactory tend to take advantage of integrated circuits and the Micro-machining technology can be used, which is being developed considerably in the field of semiconductors and has been improved in terms of reliability. With this, the recording head can easily (two-dimensional) can be made long and wide. Accordingly, the recording heads of this type have large ones Attracted attention *.

In such a thermal energy recording apparatus. However, processing is for 'a recording material in the format A4 is the total number of electrothermal transducer elements to 252G if the transducer elements are on a Full line on the shorter side of the record terials in A4 format (with 210 mm) in a density of

12. Elements are arranged per mm. This poses several problems regarding the. Reliability, reproducibility and mass production. Each of the erectrothermal transducer elements has a heating resistor ^; Stand layer which is arranged on a heating section and which is extremely reduced in terms of thickness and length. It is therefore very difficult, in comparison to the setting of resistance values of electrodes that are electrically connected to the respective heating resistor layers, all of the heating resistors.

35 'in relation to the resistance value exactly

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to adjust. If the heating resistor layers are scattering Have resistance values, the thermal energies are also applied to the respective electrothermal transducer elements generated with scattering. This is for example at the above-mentioned liquid jet recording system it is difficult to control the droplets flying out of the nozzles of the recording head, so that the aim Printing is not achievable.

In view of the above problems, it is an object of the present invention to provide a thermal energy recording apparatus capable of recording accurately at high speed at high density.
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Another object of the invention is to provide a liquid jet recording apparatus in which the scattering of flying droplets of ink from ink ejection orifices is low and that is used to record.

High quality images is appropriate.

The invention provides a thermal energy recording apparatus created, which a substrate and a plurality on the substrate as devices for producing 26th

Thermal energy from attached electrothermal transducer elements each of which has a pair of electrodes and a heating resistor layer connected to the electrodes. has and between the E'l. electrodes one Has heating section for generating the thermal energy, with a resistance value Re of the respective electrodes and a norm resistance to the value Rh of the He i / w i dniut η halo layer at the heating portion of the following condition suffice:

³ ^ 0.5 £ Re / Rh < 2.0 . -

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The invention is based on an embodiment,

■ '■. ·, · ■ a broad example with reference to the drawing explained in more detail. . ,

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Fig. 1 is. a graph showing the

; / $) - ■■ " Basis of numerical limitations relating to ^1: .." ■ · ■ · borrowed, an electrode resistance value and

... one ^: normal resistance value of a heating resistor

'stand; dssehicht' on a heating section in 10

a heat generator according to the invention illustrated.

Fig. 2 is a schematic cross section through

• 'a liquid jet recording pre-

15. ■ ' - ■ - ■■■ · ..- ■■ "". ■ - ■ * - ■ -

ι ',,' direction as an embodiment of the invention

, FIG. 3 is a partially cut-through figure- ■; ... ■ " posed - perspective view shown in Fig.

2 shown device.

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A thermal energy recording device according to the invention can have the following superior properties insofar as offering electrical thermal converters-2B.- ■■■■. ■. ■ ■;

elements, the respective thermal energy is generated with a smaller spread. ^;

■ It is now assumed that with Rh, the normal resistance of one Heating resistance layer on their heating section

ιchnungsvörrichtung referred to in a thermal energy Aufze

is, with ÄRh the maximum resistance control or resistance deviation of the heating resistance layer is ■ denoted. and with Re d-er resistance value of the Heizwider-S: ta ^? n'dssciiicht associated electrodes. The for

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Obtaining a predetermined Heirkraftwerts.an of each heating section or ford variable Leislungsver- 'need at all should ekr.rothermischen el ^Wandlerele-: menten constant or unchanged equal to "Assuming now that the at Bine reference heating resistor and a maximum Heizwiderstandssehicht Resistance scatter applied voltages are marked with, V or V + AV, then see the following equation:

(1)

By dissolving the. Equation (1) is obtained as follows

Equation:
15th

2 _ ,, ARh / Rh ν 2, ■ 1, ... χ: ■■■, ".

U + _v ; - U + χ _{+ Re / Rn} ) I ₁ + VV

According to this equation (2), the.; graphic representation can be applied, 20

In detail, on the abscissa in FIG

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Ratios of ARh to the normal resistance value Rh of the heating resistance layers cfärgestell ty »while the ratios of the voltage difference Δν to the voltage V are plotted on the ordinate, which are used to generate a heating force value at the reference heating resistance layer with the normal resistance Rh is necessary, while to generate the same heating power value at a heating resistor layer with a wide vsi aridswert, which ^{deviates from} the normalw idersiandsweri- Rh uw ARh, this voltage V plus the SpafHtunqsdifferenz AV is required. The curves are plotted for Rarg'meter Re / Rh of Q ₁ I, 0.5-, 1.0 and 2.0 »

w-r <«- w ι r

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GomäO of the representation in I icjur J, st * Mi «I dmvn, .when the maximum resistance spread or. Resistance deviation 4Rh of a heating resistance rail from the standard resistance value Rh of the reference heating between the layer, lies in a range of + 30 %:

Achieving the same-n Heizkraftvwiert-.a required - Spahnungsdifferenz ¹ AV compared to the voltage V is very small, namely about 1.5 % or less if the ratio Re / Rh equals 1 ,, 0 .. If the respective I ^ eiekt ".rot.herm.i see Wa'ndl erel ementve, with the same. Voltage are operated, therefore the scatter of the heating power values caused at the respective Heizimi derstandssschi chten is extremely reduced.

According to the invention, the resistance value should therefore. Re der. ' Electrodes, which, according to the state of the art, have essentially not been taken into account, in no small part so increased that the ratio Re / Rh is set in the aforementioned range

2Ö will. As shown in Fig. 1, the ratio Re / Rh has a most favorable value of approximately 1.0. The distribution of the heating force values on the heating resistor layers however, it can also be decreased if the Re / Rh ratio has a value in the range of approximately 1/2 to about 2.

The marking device according to the invention will now be concretely illustrated using an exemplary embodiment π in der.Form e _; A liquid jet recording apparatus shown in Figs. 2 and 3 has been described. . ,

The liquid jet recording direction has mainly one, substrate 1., electrothermal transducer elements 2 on the substrate 1, front, back and

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side walls 6, 7, 8, 9 and 10 which provide a fluid passage 5 and a first and second flow chamber 4 or 5, a nozzle opening slot 12, each of the electrothermal transducer elements .

is arranged opposite and in each of the nozzle openings 11 are formed, cover plates 13 and 14 and a supply pipe 15 for supplying the liquid the second liquid chamber 5 on.

Each of the el ect.rot.hermal Wondlerel emente 2 has.

a Heizwiderstandsschioht 16, one of selection electrodes 17, which are arranged parallel to one another on the heating resistor layers with the exception of a partial area thereof, a common electrode 18 and a -

Protective layer ". 19, which at least on the directly with. the area in contact with the liquid Liquid chamber is arranged, wherein the Srhirhten or electrodes in the specified range of are arranged one above the other beginning with the substrate 1 '. With regard to the distance value, the selection electrode 17 and -the common electrode 18 compared to the setting of the heating resistor layer 16 in one Heating area 20 can be easily adjusted. These electrodes

17 and 18 are now formed in such a way that the sum of the 25th

Resistance values of the selection el ect ι or 17 and the qomornsn-men Electrode 18 is essentially equal to the normal resistance value of the heating resistance andssch.i chi 1.6 in the Heating area 20 is.

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When the heating resistor layer 16 over the selection electrode 17 and the common electrode 18 is fed, is Heat energy generated in the heating area 20 between the electrodes. A heat-acting surface 21, on which the generated Heat acts on the liquid, is closely related.

dung with. the heating area 20. The effect of heat on the

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Thermal area 21 causes bubbles to suddenly be generated in the liquid. This works. in the liquid, a pressure a'nsl j oq b / w. Diuckr.l αΠ hoivoi, dor for ejecting the liquid through the nozzle opening 11,. ". '■" - ■

in the form of flying droplets, creating a record; Chttur) gsvoFg.sng ^; is caused.

FROM the above beach rubbing is ππ οπή cht 1 i ch, that the invention provides a thermal energy recording device results in. which is the spread or deviation. . from in the respective electrothermal selector element generated thermal energy can be reduced ' and a lifelike and reliable recording of high frequency recording signals.

16 '■. ■ ■ ■ ·

. In a thermal energy recording device with a 'Substrate and a plurality of on the substrate to create Electrothermal Waridler elements applied by thermal energy, each of which has a pair of electrodes

and a heating resistor layer connected between the electrodes and a heating section for

: evidence of thermal energy has a resistance value the respective electrodes and a normal resistance

st.andwert Rh the heating resistance t andsseb i chi on the Heizab- "■" ■■ '

stihrvitt the relationship.

: ■ 0.5 '<Ri / Rh <2.0 ^:

■ ΛΑ

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Claims (3)

Claims 1. J recording apparatus for recording using thermal energy, characterized by a substrate (1) and a plurality of _# attached to the substrate and as a means for generating inserted thermal energy electrothermal transducer elements each having a pair of electrodes (17, 18) and between the Electrode-switched heating resistor layer (16) and a heating section (20) for generating the thermal energy, wherein a resistance value Re of the respective electrodes and a normal resistance value Rh of the heating resistor layer on the heating section meet the following condition: £ 0.5 Re / Rh 5 2.0 2. Recording device according to claim 1, characterized in that the ratio Re / Rh is approximately "1" is. 3. Recording device according to claim 1 or 2, characterized in that on the substrate (1) - 2 - DE 3821 a liquid absorption part is formed which is connected to Nozzle openings (H) is provided, which respectively corresponding to one of the electrothermal transducer elements (2) arranged and made for the expulsion of the liquid the Fiüssigkeitsaufnahnfceteil are formed.